"Especially not" is a fragment.
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During their courtship and marriage, John Adams and Abigail Smith Adams exchanged over 1,100 letters, many filled with intellectual discussions on government and politics considered an invaluable account of the Revolutionary War. Abigail, a fierce advocate of rights for women and African-Americans, was an important partner throughout John's political career.
Answer: B
Explanation:
It's B because it provides strong evidence and a back bone to your claim.
